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Hydrogen and ozone gas sensing using multiple ZnO nanorods

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Abstract

ZnO nanorods grown by site-selective molecular beam epitaxy show current–voltage characteristics that are sensitive to the presence of hydrogen or ozone in the measurement ambient for temperatures as low as ∼112 °C for H2 or room temperature for O3. The sensitivity to hydrogen increases sharply with temperature and multiple nanorods contacted at both ends by ohmic electrodes show currents of ∼10-8 A at 200 °C and a differential current change of ∼18% when changing from a pure N2 ambient to 10% H2 in N2. The nanorods are able to detect small concentrations (3%) of O3 in O2, with changes in current of ∼10-7 A at 25 °C. The sensitivity was 21% for O3 at room temperature. The nanorods also show a strong response to above-band-gap illumination with ultraviolet light.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Florida, Gainesville, FL, 32611, USA

    B.S. Kang, L.C. Tien & F. Ren

  2. Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611, USA

    Y.W. Heo, D.P. Norton, B.P. Gila & S.J. Pearton

Authors
  1. B.S. Kang
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  2. Y.W. Heo
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  3. L.C. Tien
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  4. D.P. Norton
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  5. F. Ren
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  6. B.P. Gila
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  7. S.J. Pearton
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Correspondence to S.J. Pearton.

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PACS

81.05.Dz; 73.61.Ga; 72.80.Ey

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Kang, B., Heo, Y., Tien, L. et al. Hydrogen and ozone gas sensing using multiple ZnO nanorods. Appl. Phys. A 80, 1029–1032 (2005). https://doi.org/10.1007/s00339-004-3098-8

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  • DOI: https://doi.org/10.1007/s00339-004-3098-8

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